Main bearing knock pin pushed into upper case

Tim Allman · Post by **Tim Allman** » Sat Jul 18, 2015 2:09 pm

Here is a confession that I really don't want to make but here goes.

Many years ago while assembling my engine cases, I wasn't careful about aligning the pin and the race for the right side main bearing. The result is that the pin was pushed into the upper case and opened a small crack. When I discovered this at the time I found that the pin still protruded a few mm, enough to keep the race from rotating (but not enough for me to grab it with a plier), so I just aligned the bearing race and reassembled the engine.

It has worked like this for a very long time but it bugs me and I would like to extract the pin, repair the crack and reset the pin properly. Does anyone have experience with this type of repair?

LOUD MOUSE · Post by **LOUD MOUSE** » Sat Jul 18, 2015 2:23 pm

Many years back when I just started restorations I did the same thing and found it before I had other parts installed.
I split the cases, removed the chip, pushed the pin out, cleaned the case with acetone , JB Weld the chip onto the case, and put the cases together.
HAVEN'T DONE THAT AGAIN. .....................lm

Tim Allman wrote:Here is a confession that I really don't want to make but here goes.

Many years ago while assembling my engine cases, I wasn't careful about aligning the pin and the race for the right side main bearing. The result is that the pin was pushed into the upper case and opened a small crack. When I discovered this at the time I found that the pin still protruded a few mm, enough to keep the race from rotating (but not enough for me to grab it with a plier), so I just aligned the bearing race and reassembled the engine.

It has worked like this for a very long time but it bugs me and I would like to extract the pin, repair the crack and reset the pin properly. Does anyone have experience with this type of repair?

Tim Allman · Post by **Tim Allman** » Sat Jul 18, 2015 6:12 pm

What do you mean by "the chip"?

LOUD MOUSE · Post by **LOUD MOUSE** » Sat Jul 18, 2015 6:55 pm

Simple enough.
As the locator knock pin is pushed by the outer race of the bearing it will push a piece of aluminum out of the case.
I choose to call that thing a CHIP. ...........lm

Tim Allman wrote:What do you mean by "the chip"?

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Main bearing knock pin pushed into upper case

Main bearing knock pin pushed into upper case

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